Backdrop CMS up to 1.28.4/1.29.2 CKEditor 5 Rich Text Editor cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in Backdrop CMS up to 1.28.4/1.29.2. This affects an unknown part of the component CKEditor 5 Rich Text Editor. This manipulation causes cross site scripting. This vulnerability appears as CVE-2025-25062. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Backdrop CMS up to 1.28.4/1.29.2. Affected by this vulnerability is some unknown functionality of the component CKEditor 5 Rich Text Editor. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3. It doesn't sufficiently isolate long text content when the CKEditor 5 rich text editor is used. This allows a potential attacker to craft specialized HTML and JavaScript that may be executed when an administrator attempts to edit a piece of content. This vulnerability is mitigated by the fact that an attacker must have the ability to create long text content (such as through the node or comment forms) and an administrator must edit (not view) the content that contains the malicious content. This problem only exists when using the CKEditor 5 module.

The advisory is shared at backdropcms.org. This vulnerability is known as CVE-2025-25062 since 02/03/2025. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.28.5 or 1.29.3 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• Backdrop

Name

• CMS

Version

• 1.28.0
• 1.28.1
• 1.28.2
• 1.28.3
• 1.28.4
• 1.29.0
• 1.29.1
• 1.29.2

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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